Combined gas and air mixer and controller.



C. D. ROBB. COMBINED GAS AND AIR MIXER AND CONTROLLER.

APPLICATION FILED MAR. I8, I9I8.

Patented Dec. 3, 1918.

1% jJ a 13 16' I 5 6 a 12 I ll 1,7 10 1 J QJIIIIIIIIIIIII r TED STATES;PATET. FFICE.

CLIFFORD 1). R033, or WEST VIEW;PENNSYLVANIA.

COMBINED GAS AND AIR IXER AND CONTROLLER.

Specification of Letters Patent.

Patented Dec. 3, 1918.

A pplicationfiledMarch 18, 191 s. Seria1No.223 ,175.

tion is to provide a simple and cheap construction for regulating andcontrolling the amount of air and gas fed to a pipe or con-- duitthrough which it is fed to aburner or burners.

The improvement is particularly intended to supply a proper mixture ofair and gas to burners for stoves, water heaters, hot air furnaces,steam and 'hot water boilers, etc., whereby proper combustion andmaximum efiiciency of the burners are accomplished. In theaccompanyingdrawings- I Figure 1 is a longitudinal central sectionalview of a device embodying my invention. p

Fig. 2 is a transverse sectional view on the line 2-2 of Figfl, lookingin the direction indicated by arrow.

Fig. 3 is a front elevation of the adjustable air-controlling disk.

Referring now to the drawings my improvement comprises 'a body-portion1,

which is preferably made bell-shape with its larger and inlet end 2extending outward, while its inner contracted end 3v is provided with alongitudinally extending annular flange 4. The flange 4 and pipe 5telescope each other and fit tightly as shown, and are held together bya suitable clamping screw 6.

Projecting radially inward from the outer end of the bell-shapedbody-portion 1, is an arm 7, which has its inner end beyond the centerof the body member 1, and projecting outwardly from the arm 7 is an armor member 8, the members 7 and 8 together constituting an L-shapedmember.

The said arm 7 is provided with a longitudinally and centrally locatedscrewthreaded passage 9, which has its inner end communicating with thegas passage 10, the

latter extending transverse the passage 9 and located at a point whichis the center of the axisof the bell-shaped body portion 1; This passage10 communicates with an enlarged passage 11 formed in the outwardlyextending member 8.

For the purpose of cheapness, the arms 7 3 and 8 are cast integral witheach other, and the arm 7 cast integral with the body portion 1, and allthree of these parts composed of cast-iron.

A screw threaded rod 12 engages the screw threads of the opening 9 andhas its outer portion 13 smooth, and the outer end of the passage 9 isenlarged, as shown at 14, and screw-threaded to receive a nipple 15 foradjustably compressing a suitable packing 16 located within the enlarged"portion 1 1 of theopening 9. This constitutes a stuifingbox for makingthe screw rod gas-tight and preventing the escape of gas through theopenings 9 and 14. The outer end of the rod 13 is providedwith a knurledhead 17 by which the rod 13 is turne'dfor the purpose of adjusting it.This rod 13 is made of a diameter corresponding with the diclosecompletely the said passage 10 when desired. The lower end of the'rod 13is provided with a cone-shaped seat 18 adapted to cooperate with anadjustable cone shaped screw 19.

' I The disk 20 has a flange 21, the outer end screw-threaded. This disk20 is adjustable toward and away from the open end 2 of the bell-shapedmember 1, and thereby controls the amount of air that is admittedthereto. For the purpose of facilitating the turning of this disk 20, itis provided with a plurality of projecting studs 24, whereby it may bereadily turned for adjustment.

In operation gas is supplied to the passage 11 of the arm 8 through anysuitable pipe (not shown) and the amount of gas flowing to thebell-shaped body 1 is regulated and controlled by the adjustable rod 13,while the amount of air admitted is controlled by adjusting the disk 20.The gas and air meet as the gas flows from the inner end of the passage10 and are thoroughly combined and mixed as they pass through the pipe 5to the burner or burners.

'ameter of the passage 10, whereby it will having one armth'ereofextending radially inward from the open-end of the said bodyportion andthe other arm extending outward-ly, a gaspassage passing through theoutwardly extending arm and the'inner end iofthe inwardlyextending arm,a valve passing throughthe inwardly extending armand 'controllingthesaid :passage, and avdisk adjustably supported upon the outwardlyextending arm-and adapted'tobemoved .to-'

ward and away from the open end of the --body-'portion;, substantiallyas described.

-. 2. A, gas and air mixer for burners of the iOhELI ELCtBI described,the improvement comprising an open ended body, an L-shaped memberextending radially inward fro nthe ,opentend of'saidbody portion, onearm of .the "Lextending-outwardly and having a passage'therethrough:andthrough the inner end of the arm extending radially inward, ,theinwardly extending arm'ca rrying a valve ocontrolling the said passage,the outwardly extending arm v, having external tscreiv lthreads,and-adisk mounted Qn-the screw threads and adjustablev toward and awayfrom. thewopennend, for the purpose described. I

3. A gas and air mixer for burners, com- 'prisinga body portionhaving-an open outer 'end, ;an .L-shapecl. nember mounted in the openendof the body portion with onearm extending radiallyinward from thewallof Copies of this patent inayme obtained ioi-e five cents each:byladdrcjssing the Car na issioner of retcnt l,

the body portion and its outer surface apinner end of the inwardlyextending arm,- a

disk mounted on the outwardly extending arm-andqadjustable toward andaway from the open end to control the passage of air through the openend, anda valve passing through "the inwardly extending arm andcontrolling the flow of gasithrough thepassage of the 'L-shaped member,substantially vussh'own.

4. A combined prisinga 'bell-shapedz body portion having its' largestendopen, an L-shaped member supported within the open vend with thejuncture .of the L substantially at the center of the body-portion, agas passage extend- ,ing through th juncture of the two arms of theL-shaped member and :longitudinally of air and gas mixer, comthebody-portion, one armtof the L-shaped member extending radially inwardfrom the outer nd; oi thebell-shaped body-portion, a, rod passing:llongitud inally through the radially extending arm and having its innerend. actingv ato control the gas passage-and its. outer end projectingbeyondthe body,

portion and. adapted to turn for regulating the valve, ,the other arm oi-the L extending outward and :externally screw-threaded, and

a disk carried on the/second saidann and adjustable'in and out on thescrew thread I.

for controllingthe airgfedtouthe body portion,' whereby the (gas. andair fedthrough the mixeravare separately controlled. I

In testimony whereof I hereunto ailix my signature in :the presence ,oftwo witnesses.

VVitnesses: p

THOMAS M. Born,

CAREY Vllrrrrn; I

